• 20 ml of autologous whole blood will be collected into tubes containing acid citrate dextrose and centrifuged at 1500 rpm for 10 minutes in order to get PRP at the top of the test tube. Then, the PRP will be further centrifuged at 3700 rpm for 10 minutes at room temperature of 22°C in order to obtain a platelet count 4.5 times higher than the base line. Platelet-poor plasma (PPP) will be partly removed and partly used to resuspend the platelets. Calcium gluconate will be added as an activator (1:9), i.e., 1 ml of calcium gluconate in 9 ml of PRP

• Topical anesthetic cream will be applied for halfan hour on the involved area.
• polydioxanone mono threads (50 mm, 27 G) will be inserted at 1-cm spacing into the dermal layer of the skin; the threads will be arranged in a transverse and vertical line in the form of a mesh similar to cross-hatching technique.
• The total numbers will range from 8 to 10 each side. The skin of the face will be stretched by the non-dominant hand of the physician and the needle will be inserted by the other hand through the required point.

• Topical anesthetic cream will be applied for 30 minutes before the procedure.
• BX300 device from AMI inc.,Korea will be used.
• Different settings will be used according to each individual case regarding the type of scar, severity and skin type fluence ranging from 36 to 42 j/cm2 will be used and pulse duration 1.8 ms.
• In an attempt to avoid common side effects that occur with fractional laser treatment, a lower fluence will be used in the first session and depending on the results, the fluence will be increased per treatment session.